Lens-grinding machine.



D. COAN.

LE NS GRINDING MACHINE.

APPUCATION FILED DEC-291 |9|4.

1,259,563. Patented Deo.18,1917.

2 SHEETS-SHEET I.

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LENS enmoma MACH INE.

APPLICATION FILED DEC29| 19M.

2 SHEETS-SHEET 2.

I 5mm, ado a %13 614mm 4. r

navrn coen, or SYRACUSE, new YORK. a

' .LENS-GRINDING mncnmn.

' To all whom it may concern:

' of the United States,

Syracuse,

a State of New York, have invented a certain Be it known that I, DAVID. COAN, a citizen and a resident of in the county of Onondaga and new and useful Lens-Grinding Machine, of

I which the following is a specification.

This invention has for its object the procylinder lenses in which machine the mothe grinder is a constantly changing curved path. composed by a number of I the entire surface ofthe lens; andthe-in-Z vention consists in the comb nations and.

constructions hereinafter loops none of which coincide durin of movement any given point on the grinder W111 traverse I set forth and claimed.

' In describing this invention, reference is had to the accompanying drawlngs, 1n

- which likecharacters designate correspond ing parts in all the views'. p

' Figure 1 is a side elevation', partly in section, of my machine. v

Fig. 2 is an enlarged sectional view on line A-'A, Fig. 1. I

Fig; 3'is an indicator and or chat innstrating the resultant of the-movements of the two carriages.

- Fig. 4 is a fragmentary detail view mus-g trating a portion of the power transmitting This lens grinding machine comprises, H

generally,

a carriage ,for supporting a grinder, a carriage for supporting the ens, the carriages being movable in directions at an angle to each other usuallv in parallel 1 planes. and means for actuating the carspeed whereby a or loop motion between the lens and grinder riages simultaneously at difierent rates of relative irregular elliptical j isefi'ected;v '1 is the frame of the mach1ne,-2 and '3 are respectively, carriages which are here shown ing movable along a as reciprocating carriages arran right angle to each other,

guide 4 on the machine and the carriages 3 being movable at a right angle to the carriage 2 in a guide 5, the car-' riage 3 being located above the carriage 2;

.In the machine hereillustrated there is v one carriage 2 carrying a plurality of grind-1 Specification of Letters Patent.

porting a cycle of the carriage and in which,

- other,

ed at a the carnage 2 be- Patented Dec. 18, 1917. I Application filed December 29, 1914. Serial No. 879,469. r l

stares ATEN onmcn;

ers G and a plurality of carriages 3 for sup-- the lenses being operated upon by the grlnders 6. Each carriage 3 consists of a square bar slidable in one of the guides 5.

The carriages carry at their outer ends vertlcal tubular guides 8 in which are slidably 1 mounted lens holder stems 9, each stem 9' at its lower end to any suitable carrying a device 10 which thelens 11 is secured in manner. Each stem -9 moves. rectilinearly in its holderi8 and is pressed downwardly v means of a spring 12 secured at one end",

at 13 to a standard--14 risi'ngfrom the frame f 1, and which at its other end'to a socket piece 15 fitsover 'a-ball 16 on'the upper end of the stem 9. 'Each' spring 12 is tensio'ned by means of a nut 17 end of a stationary screw frame 1' and extending through a hole in the :spring 12, the nut 17 upper face of the screwing against the spring turning on the upper 18 rising from the 12 .for regulating l s the tensionthe'reof. .Thelens holder stems 9 are arranged at anangle to a direction of Each carriage 3'is also formed with a i located near the holder movement ofits carriage.

vertical bracket 19 8,'the bracket 19 carrying. a device 20 coacting with the'block against the grinder.

10-for holding the lens The bracket '19 is held;

in its adjusted position by 'a. set screw 21.

cludes mechanism whereby one carriage is, driven at a diflferent rate of speed'from the and as here shown, said means com-f connections between the mechanisms of this prises a pair of shafts 22, 23" journaled in vmachine.

i The'means for actuating the carriages in',';

' the frame 1 andextending parallel to the direction of movement of the. carriage 2,

powertransmitting :means between. the shafts respectively. and the carriages 2, 3, and power transmitting means between the shafts whereby one ferent rate of speed from the other.'

shaft is driven at a dif- 7 The power transmitting means between-" the-shaft 23 and the carriages 3' comprises eccentrics including'd isks '24 mounted on the pivoted at 31 to a vertical-movable rack 32 'slidable'in. a, suitable guide in the frame, a segment 33 meshing with the racki32, a rock shaft 34 on which the segment links 26 rigid with the straps and pivoted at link 30 which is 110. a is mounted,

the shaft 34. extend g crosswise f the the s'haft 22 and. lie-carriage 2 includes an -,eccentr1c 28, a strap 29, a

shafts 22, 23, and a second segment 35 mounted on the shaft 34 and meshing with a rack36 on the underside of the carriage 2. The connection between the shafts 22 and 23 whereby the shaft 22 is driven at a dif:

ferent rate of, speed from that of the shaft 23. consists j of intermeshing vgears 37, 38 mounted respectively on the shafts, said gears being of different diameters. The

gears 37, 38 are located at one'end of the frame and the shaft 34 is located between the ends of the frame.

I As will be understood by those skilled in the art, are rovlded and a particular grinder for pro' ucing a required lens is placed on the carriage 2 in 'any suitable manner, each grinder being here shown as having. a socket which fits over a'post 39 .on the carriage 2 and which is held from turning bya trans- 1 verse pin 40 in said post, the pin entering open ended slots 41. a v

.In operation, when the grinders have been placed -i n-position on the carriage 2 and the lenses to be ground are placed on the stems 9 and held in position by the part 20 and when the machine'is started the carriage 2 will be 'reciprocated at a less rate of speed than the carriages 3 so that the resultant of the two motions is a series of constantly changing irregular loops, such as illustrated;

I in 3.

What I claim is: g In a lens ding machineyreciprocat ingcarriages for the grinder and the-lens res ectively, the carriages beingarranged to e moved at an angle to each other,'the grinder carriage being formed with a rack, i means for actuating*-. the .carriages compris 40 ing'a' pair of shafts extending'parallel to the direct on of movementfof' the grinder carriage, an eccentric on one shaft connected to the lens carriage, an eccentric on the-other shaft, a reciprocating rack connected'to the latter eccentric, a shaft extending crosswise of'the former shafts and. having segments thereon, one segment meshing with the rack of the grinder carriage and theother meshing with the second named rack, nd power transmitting, means between 'the shafts whereby one shaft is 'actuated by the other at adifi'erent rate of speed, substantially as v and for the purpose'described.

rinders 6 of different curvaturesv Q f 1,aao,ses

2. In a lens grinding machine, a reciproeating lens carriage having a guide at one end fixed thereto and arranged at an angle to the movement of the carriage, a stem slidably mounted in the guide, a device at one end of the stem for engaging the lens, and spring means fixed relatively to the carriage and acting to press on the other end of the I 'stem, the stem and the spring means being an angle to the movement of the carriage, the lens holder including a stem movable in the guide and having a'device at one end for the bracket and extending, in a direction at engaging the 1ens,.-'springmeans acting on 'c the other end ofthe stem, means carried by the bracket'and' coacting withthe lens holder for holding the lens against the grinder, 'a

grinder-carri'age movable in adirection at, an angle vto the lens carr1age,.and means for actuating the carriages, substantially as and for the purposeidescribed. v

' i rocating lens carriage movable diiferentdistances in directions at an angle to each other,

A lens grinding machine comprising a reclprocating grinder" carriage and a recipand means for operating thefcarriages at. f

'difierentrates of'speed relatively to each "other, during their reciprocating movements,

said [mechanism including shafts, means mountedson the shafts and connectedfrespectively to'the carriages, intermeshing gears .ofdifi'erentdiameters mounted-on the shafts, and means for actuating-one of the 1. set forth.

hafts, substantially as and, for the purpose 1 In testimony whereof, I have hereunto signed my name in the presence of two at "of Onondaga, and State ofNew York, this;

1 testing witnesses, at Syracuse, in the county 23rd day of December, 1914. a

:Witnesses: I a 3 S. Davis,"-

-- T, PIoKARn.

; DAVID COAX. 

